What is a public facility?

How has it evolved since Cerdà studied thoroughly the city-life of Ciutat Vella back in 1850?

From ecclesiastic to secular; from a faith based city to a knowledge based city; Barcelona has evolved along the history to become one of the most advanced city when it comes to public service facilites’ supply. Here it is, a research work that analyzes and visualizes the evolution of these services in the timespan from 1850 to today.